1   
2   unit Unit1;
3   
4   interface
5   
6   uses
7     Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
8     Dialogs, StdCtrls;
9   
10  type
11    TForm1 = class(TForm)
12      Button1: TButton;
13      procedure Button1Click(Sender: TObject);
14    private
15      { Private declarations }
16    public
17    function GetCurrentUserName: string;
18      { Public declarations }
19    end;
20  
21  var
22    Form1: TForm1;
23  
24  implementation
25  
26  {$R *.dfm}
27  
28  function TForm1.GetCurrentUserName: string;
29  const
30    cnMaxUserNameLen = 254;
31  var
32    sUserName: string;
33    dwUserNameLen: DWORD;
34  begin
35    dwUserNameLen := cnMaxUserNameLen - 1;
36    SetLength(sUserName, cnMaxUserNameLen);
37    GetUserName(PChar(sUserName), dwUserNameLen);
38    SetLength(sUserName, dwUserNameLen);
39    Result := sUserName;
40  end;
41  
42  procedure TForm1.Button1Click(Sender: TObject);
43  begin
44    ShowMessage(GetCurrentUserName);
45  end;
46  
47  
48  end.
49